Skip to Main Content
Calculating moisture content for 1000-hour timelag fuels in western Washington and western Oregon.Author(s): Roger D. Ottmar; David V. Sandberg
Source: Res. Pap. PNW-RP-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 16 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
Download Publication (1.0 MB)
DescriptionA predictive model is presented to calculate moisture content of 1000-hour timelag fuels in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) logging slash in western Washington and western Oregon. The model is a modification of the 1000-hour fuel moisture model of the National Fire-Danger Rating System and requires daily measurements of precipitation duration, maximum and minimum relative humidities, and maximum and minimum temperatures. Comparison of measured and calculated fuel moisture contents showed good agreement. The model allows managers to accurately calculate fuel moisture values from weather variables for fuel reduction estimates. Current fire-weather stations provide adequate weather data for satisfactory operation of the 1000-hour fuel moisture model.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationOttmar, Roger D.; Sandberg, David V. 1985. Calculating moisture content for 1000-hour timelag fuels in western Washington and western Oregon. Res. Pap. PNW-RP-336. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 16 p
KeywordsFuel moisture content, fire danger rating
- Effects of release from suppression on wood functional characteristics in young Douglas-fir and western hemlock.
- Production of wood pellets from Alaska-grown white spruce and hemlock
- Estimating the weight of crown segments for old-growth Douglas-fir and western hemlock.
XML: View XML